Yeah... okay.
Vega's ultra isn't quite there either.. I guess you can land it on a dizzy?
The problem is the Raging Demon is that
1- It's VERY to see coming from a MILE away (except in the hands of very good players)
2- It's VERY easy to avoid. Probably the easiest Ultra to avoid in SF4, imo.
Fuerte's Ultra is awesome, but you need to know the exact range it has for it to be useful. I suck with Fuerte, mind you, but after a Tortilla Buster you're in perfect range, so if you time it well you pretty much always hit (unless the people I was playing are absolutely stupid and just can't evade at all). It's also pretty good as anti-air, if you can time it.